Improve the code as per latest Julia v1.2

[rahulkp220]

The existing code still runs on the old version of Julia and I would love to have it bumped up. Contributions are absolutely welcome.

Note:

• Need a great readme.md update as well along with the course.
• Do test your code and add test cases to the main repo.

[rahulkp220]

@polytomous would you love to take the lead? 😃